From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jaehoon Chung <jh80.chung@samsung.com>
Subject: Re: [RFC PATCH v3 2/5] Documentation: synopsys-dw-mshc: add bindings
 for idmac and edmac
Date: Thu, 06 Aug 2015 11:20:03 +0900
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To: Doug Anderson <dianders@chromium.org>, Shawn Lin <shawn.lin@rock-chips.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>, Seungwon Jeon <tgih.jun@samsung.com>, linux-mips@linux-mips.org, Arnd Bergmann <arnd@arndb.de>, Alexandre Belloni <alexandre.belloni@free-electrons.com>, Alexey Brodkin <abrodkin@synopsys.com>, Stefan Agner <stefan@agner.ch>, Zhou Wang <wangzhou.bry@gmail.com>, Kumar Gala <galak@codeaurora.org>, Alim Akhtar <alim.akhtar@samsung.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Wang Long <long.wanglong@huawei.com>, Rob Herring <robh+dt@kernel.org>, Chaotian Jing <chaotian.jing@mediatek.com>, Lukasz Majewski <l.majewski@samsung.com>, Jun Nie <jun.nie@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Kevin Hao <haokexin@gmail.com>, Olof Johansson <olof@lixom.net>, Ray Jui <rjui@broadcom.com>, Govindr
List-Id: devicetree@vger.kernel.org

On 08/06/2015 11:16 AM, Doug Anderson wrote:
> Shawn,
> 
> On Wed, Aug 5, 2015 at 1:17 AM, Shawn Lin <shawn.lin@rock-chips.com> wrote:
>> synopsys-dw-mshc supports three types of transfer mode. We add bindings
>> and description for how to use them at runtime. Without idmac and edmac
>> property, pio is the default transfer mode. Make sure that Idmac and emdac
>> should not be used simultaneously.
> 
> Can't you just read the HCON register?
> 
> [17:16]: DMA_INTERFACE
>  00: none
>  01: DW_DMA
>  10: GENERIC_DMA
>  11: NON-DW-DMA

If read it and get the exactly information. I think we can use that information.

Best Regards,
Jaehoon Chung

>